いらっしゃる

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Originally a contraction of いらせらる(iraseraru), itself an honorific conjugation of 入ら(ira, the 未然形(mizenkei, “imperfective”) of verb iru, “to come in, to go in; to arrive; to be in a place”) + せ(se, the 未然形(mizenkei, “imperfective”) of honorific auxiliary verb su) + らる(raru, the older form of passivizing auxiliary verb rareru, here serving as another honorific).[1][2]